Newcastle Beach Park Weather Forecast

    • 48
    • 64

    Increasing Clouds

    • 46
    • 65

    Partly Sunny

    • 54
    • 67

    Rain Likely

    • 53
    • 64

    Rain Likely

    • 51
    • 64

    Mostly Cloudy

    • 50
    • 64

    Chance Rain

Today 26 Sep Eastside

Mostly sunny. Patchy fog in the morning. Highs in the lower to mid 60s. Southeast wind to 10 Mph in the morning becoming light.

Tonight 26 Sep Eastside

Mostly cloudy. Lows in the 40s to lower 50s. North wind to 10 Mph in the evening becoming light.

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Newcastle Beach Park Temperature Statistics

September Temperature

Renton Municipal Airport (5 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.3 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (5 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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